Yeah, you can load up pretty much any Source map in any other Source game, provided it doesn't have game-specific entities and you can provide the assets. Plus every Source game has all the HL2 assets in it by default. I believe each game can only load maps of a single BSP version. Some TF2 sounds are from HL2.
You should play, Half-life 1, (add-ons include, opposing force, blue shift, decay, and the mod remake of half life 1, Black Mesa). Then play, Portal 1 (if you have it). Half life 2, HL2 episode 1, HL2 episode 2, Portal 2, and then maybe play TF2 just for fun.
To play with friends, subscribe to the collection, select Half-Life Co-op gamemode in the bottom right and just start hls00amrl map ( Half-Life Resized Maps category) through Garry's Mod menu. To start up a dedicated server, add the following line to srcds launch properties. +host_workshop_collection 1477402092 +gamemode hl1coop +map hls00amrl.
To play Half Life Alyx on Meta Quest 2, you now have a co Tutorial on how to play Half Life Alyx on Oculus Quest 2 using Virtual Desktop and Oculus Air Link.
HALF-LIFE sends a shock through the game Half Life 2 Multiplayer - How to Play Splitscreen [Gameplay] on Nucleus Coop (Up to 4 Players)Game Information:1998.
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how to play half life 2